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	<head>
		<title>three.js webgl - postprocessing - unreal bloom</title>
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		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="https://threejs.org/files/main.css">
		<style>
		#info > * {
			max-width: 650px;
			margin-left: auto;
			margin-right: auto;
		}
		</style>
	</head>
	<body>

		<div id="container"></div>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Bloom pass by <a href="http://eduperiment.com" target="_blank" rel="noopener">Prashant Sharma</a> and <a href="https://clara.io" target="_blank" rel="noopener">Ben Houston</a>
			<br/>
			Model: <a href="https://blog.sketchfab.com/art-spotlight-primary-ion-drive/" target="_blank" rel="noopener">Primary Ion Drive</a> by
			<a href="http://mjmurdock.com/" target="_blank" rel="noopener">Mike Murdock</a>, CC Attribution.
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "https://threejs.org/build/three.module.js",
					"three/addons/": "https://threejs.org/examples/jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import Stats from 'three/addons/libs/stats.module.js';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
			import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
			import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
			import { UnrealBloomPass } from 'three/addons/postprocessing/UnrealBloomPass.js';
			import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';

			let camera, stats;
			let composer, renderer, mixer, clock;

			const params = {
				threshold: 0,
				strength: 1,
				radius: 0,
				exposure: 1
			};

			init();

			async function init() {

				const container = document.getElementById( 'container' );

				clock = new THREE.Clock();

				const scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 100 );
				camera.position.set( - 5, 2.5, - 3.5 );
				scene.add( camera );

				scene.add( new THREE.AmbientLight( 0xcccccc ) );

				const pointLight = new THREE.PointLight( 0xffffff, 100 );
				camera.add( pointLight );

				const loader = new GLTFLoader();
				const gltf = await loader.loadAsync( 'https://threejs.org/examples/models/gltf/PrimaryIonDrive.glb' );

				const model = gltf.scene;
				scene.add( model );

				mixer = new THREE.AnimationMixer( model );
				const clip = gltf.animations[ 0 ];
				mixer.clipAction( clip.optimize() ).play();

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				renderer.toneMapping = THREE.ReinhardToneMapping;
				container.appendChild( renderer.domElement );

				//

				const renderScene = new RenderPass( scene, camera );

				const bloomPass = new UnrealBloomPass( new THREE.Vector2( window.innerWidth, window.innerHeight ), 1.5, 0.4, 0.85 );
				bloomPass.threshold = params.threshold;
				bloomPass.strength = params.strength;
				bloomPass.radius = params.radius;

				const outputPass = new OutputPass();

				composer = new EffectComposer( renderer );
				composer.addPass( renderScene );
				composer.addPass( bloomPass );
				composer.addPass( outputPass );

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.maxPolarAngle = Math.PI * 0.5;
				controls.minDistance = 3;
				controls.maxDistance = 8;

				//

				const gui = new GUI();

				const bloomFolder = gui.addFolder( 'bloom' );

				bloomFolder.add( params, 'threshold', 0.0, 1.0 ).onChange( function ( value ) {

					bloomPass.threshold = Number( value );

				} );

				bloomFolder.add( params, 'strength', 0.0, 3.0 ).onChange( function ( value ) {

					bloomPass.strength = Number( value );

				} );

				gui.add( params, 'radius', 0.0, 1.0 ).step( 0.01 ).onChange( function ( value ) {

					bloomPass.radius = Number( value );

				} );

				const toneMappingFolder = gui.addFolder( 'tone mapping' );

				toneMappingFolder.add( params, 'exposure', 0.1, 2 ).onChange( function ( value ) {

					renderer.toneMappingExposure = Math.pow( value, 4.0 );

				} );

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				const width = window.innerWidth;
				const height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );
				composer.setSize( width, height );

			}

			function animate() {

				const delta = clock.getDelta();

				mixer.update( delta );

				stats.update();

				composer.render();

			}

		</script>

	</body>

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